Diaphragm pump



FIG. 1 is a front isometric view of a diaphragm pump showing our new design;

FIG. 2 is a front view;

FIG. 3 is a left side view;

FIG. 4 is a rear view;

FIG. 5 is a right side view;

FIG. 6 is a top view; and,

FIG. 7 is a bottom view.

The broken lines are included for the purpose of illustrating portions of the diaphragm pump that form no part of the claimed design. 

CLAIM The ornamental design for diaphragm pump, in four embodiments as shown and described. 